Two days later, a pair of homegrown Islamic extremists stormed a Catholic Mass in the quiet French town of Saint-Etienne-du-Rouvray, Normandy.

Teenagers Adel Kermiche and Abdel Malik Petitjean, who had both previously tried to flee to Syria to join the depraved terror group, murdered an elderly Catholic priest and severely wounded another man before being gunned down by police.